Ho M.-H.,National Chiao Tung University |
Balaganesan B.,E ray Optoelectronics Technology Co. |
Chen C.H.,Guangdong Aglaia Optoelectronic Materials Co. R506
Israel Journal of Chemistry | Year: 2012
The phenomenon of organic electroluminescence (EL) was first discovered from studies on anthracene crystals in the 1960s. Since then, its derivatives have been studied extensively in applications such as organic light-emitting diodes (OLEDs) and organic thin-film transistors because of their excellent EL, transport, and good electrochemical properties. A blue fluorescence emitter based on anthracene is also important in constructing hybrid tandem white OLEDs for lighting applications. This article provides a review about the development of blue host OLED materials based on molecules designed and derived from the core structure of anthracene and their application as bipolar charge-carrier transport materials in OLEDs. The recent development of efficient, stable, blue-doped p-i-n OLEDs with simplified device architecture based on the single common host 2-methyl-9,10-di(2-napthyl)anthracene, with its stable thin-film morphology, large band gap energy, high fluorescence quantum yield, and ambipolar charge-carrier transport properties, is also highlighted. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
Chang Y.-F.,National Chiao Tung University |
Meng H.-F.,National Chiao Tung University |
Fan G.-L.,National Taiwan University |
Wong K.-T.,National Taiwan University |
And 4 more authors.
Organic Electronics: physics, materials, applications | Year: 2016
Organic light-emitting diodes (OLEDs) with a low driving voltage and efficient blue fluorescence were fabricated through blade coating. Tris(8-hydroxyquinolinato)aluminum (Alq3) is a relatively stable electron-transporting material commonly used in evaporation. However, depositing Alq3 through a solution process is difficult because of its extremely low solubility organic solvents, a result of its symmetrical molecular structure. In this study, Alq3 was successfully deposited through blade coating at a very low concentration below 0.1wt%. The OLEDs contained co-dopants BUBD-1 and p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph), and a high-band-gap host 2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN) as the emission layer with the following structure: ITO/PEDOT:PSS (40 nm)/VB-FNPD (30 nm)/MADN:2% BUBD-1:1% DSA-Ph (50 nm)/TPBI (30 nm)/LiF (0.8 nm)/Al (100 nm)or ITO/PEDOT:PSS (40 nm)/VB-FNPD (30 nm)/MADN:3% BUBD-1 (50 nm)tris(8-hydroxyquinolinato)aluminum (Alq3; 10 nm)/LiF (0.8 nm)/Al (100 nm). 2,7-disubstituted fluorene-based triaryldiamine(VB-FNPD)is the cross-linking transporting material. The device exhibited a peak current efficiency of 5.67 cd/A for Alq3 and 5.76 cd/A for TPBI. The device with Alq3 has operated lifetime seven times higher than the device with TPBI. © 2015 Elsevier B.V. All rights reserved. Source
E Ray Optoelectronics Technology Co. | Date: 2013-08-16
The present invention discloses an electrically conducting composition that include a charge transporting oligomer selected either from oligoanilines and/or oligothiophenes and electron accepting dopants; and further contain conductivity enhancing substances such as ionic liquids, or a nanoparticle, dissolved in a mixture of at least two solvents to achieve the desired formulation for making the electrically conductive layer for organic electronic devices.
E Ray Optoelectronics Technology Co. | Date: 2015-06-17
The present invention provides a high triplet energy compound of Formula 1 for an organic electroluminescent device: In Formula 1, X represents an oxygen or a sulfur atom, and represents a substituted or unsubstituted hetero-aromatic ring containing at least two nitrogens or an alkyl group with C2 to C6. The organic electroluminescent device including the compound used in an emissive layer or an electron transporting layer enhances the efficiency and the stability of the device.
E RAY OPTOELECTRONICS Technology CO. | Date: 2013-12-06
The present invention discloses a novel compound of Formula 1, and an organic electroluminescent device using the same. In Formula 1, X and Y independently represents an aromatic or a hetero aromatic hydrocarbon having a carbon number of from 5 to 10. Ar